Echo CS-450 Service Manual


Echo CS-450 Service Workshop Manual for the Echo 450 chainsaws. View free page images online or download PDF with images, diagrams and information. Print or save to any device.
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Echo CS-450 Service Manual Repair

Echo CS-450 Service Workshop Manual for the Repair and service of Echo 450 chainsaws. The PDF manual has diagrams and acurate information to help to troubleshoot, repair and fix the Echo chainsaw. View free page images online or download a PDF manual that you can easily save, print or view on most devices.

Echo CS-450 Service Manual-Service Data


Specification, Technical data, Torque limits, Special repairing materials, Service limits., Special tools.


General adjusting rules, Presetting idle adjust screw, L mixture needle and H mixture needle, Adjusting carburetor.

See the additional carburetor manual, parts list, operator manual and technical supplements PDF download available on this website for more information on how to service and repair the chainsaw.

Echo CS-450 Chainsaw Specifications

Echo CS-450 chainsaw carbureter type: Walbro WT-901, OEM Part Number A021-001471.

Model: CS-450


Length: mm(in) 400 (15.8)
Width: mm(in) 252 (9.9)
Height: mm(in) 278 (10.9)
Dry weight: kg(lb) 5.0 (11.0)


Type: KIORITZ, air-cooled, two-stroke, single cylinder
Rotation: Clockwise as viewed from the output end
Displacement: cm3(in3) 45.0 (2.75)
Bore: mm(in) 43.0 (1.69)
Stroke: mm(in) 31.0 (1.22)
Compression ratio: 7.1


Type: Diaphragm horizontal-draught, with auto-return choke
Model: Walbro WT-901
Venturi size-Throttle bore: mm(in) 13.5 – 15.85 (0.532 – 0.624)


Type: CDI (Capacitor discharge ignition) system with electronic timing advancer
Spark plug: BPMR8Y

Exhaust Muffler type: Spark arrestor muffler


Type: Automatic rewind
Rope diameter x length: mm(in) 3.5 x 850 (0.13 x 33.4)


Type: Premixed two-stroke fuel
Mixture ratio: 50 : 1 (2 %)
Petrol: Minimum 89 octane petrol Two-stroke air cooled engine oil ISO-L-EGD (ISO/CD13738), JASO FC/FD
Tank capacity: L (U.S.fl .oz.) 0.45 (15.2)

Clutch Type: Centrifugal, 3-shoe slide with 3-tension spring
Guide bar / Saw chain lubrication type: Automatic with volume adjuster
Oil Tank capacity: L (U.S.fl .oz.) 0.28 (9.5)
Auto oiler Type: clutch related type


Type: Floating rim
Number of teeth: 7
Pitch: in 0.325

Cutting devices

Guide bar:

Type: 38RV58-325, 45RV58-325, 50RV58-325
Called length: cm 38, 45, 50
Gauge: in 0.058

Saw chain:

Number of drive links: 64, 72, 80
Pitch: in 0.325
Gauge: in 0.058

Adjusting carburetor

1. Start engine and warm it up at idle for one minute. Turn H mixture needle anticlockwise until engine speed drops to approx. 11,500 r/min.
2. Warm it up well for 100 sec alternating engine speed between WOT (Wide Open Throttle) for 5 seconds and idle for 5 seconds .
NOTE : Do not run engine at high speed without load longer than 5 seconds, or engine damage may occur.
3. Adjust L mixture needle with 3 mm blade screwdriver to reach maximum engine speed just before lean drop off.
4. Set idle engine speed to 3,900 r/min by turning Idle adjust screw. Engine speed should be stable at 3,900 +/- 50 r/min after Idle adjust screw adjustment.
5. Turn L mixture needle anticlockwise reducing engine idle speed 1,400 r/min to set idle speed at 2,500 r/min. The engine idle speed range is 2,400 – 2,600 r/min.
NOTE : Engine speed must be allowed to stabilize a minimum of 20 seconds after each adjustment of L mixture needle…read more in the manual

See manuals for more chainsaw specs..

Echo CS-450 Service Workshop Manual PDF

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